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Add field for peer's raw public key to TLS handshake param structure

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When removing the (session-local) copy of the peer's CRT chain, we must
keep a handshake-local copy of the peer's public key, as (naturally) every
key exchange will make use of that public key at some point to verify that
the peer actually owns the corresponding private key (e.g., verify signatures
from ServerKeyExchange or CertificateVerify, or encrypt a PMS in a RSA-based
exchange, or extract static (EC)DH parameters).

This commit adds a PK context field `peer_pubkey` to the handshake parameter
structure `mbedtls_handshake_params_init()` and adapts the init and free
functions accordingly. It does not yet make actual use of the new field.
This commit is contained in:
Hanno Becker
2019-02-06 16:18:31 +00:00
parent 494dd7a6b4
commit 75173121fe
2 changed files with 14 additions and 0 deletions
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10
library/ssl_tls.c
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@ -7173,6 +7173,11 @@ static void ssl_handshake_params_init( mbedtls_ssl_handshake_params *handshake )
#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
handshake->sni_authmode = MBEDTLS_SSL_VERIFY_UNSET;
#endif
#if defined(MBEDTLS_X509_CRT_PARSE_C) && \
!defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
mbedtls_pk_init( &handshake->peer_pubkey );
#endif
}
static void ssl_transform_init( mbedtls_ssl_transform *transform )
@ -9519,6 +9524,11 @@ void mbedtls_ssl_handshake_free( mbedtls_ssl_context *ssl )
}
#endif
#if defined(MBEDTLS_X509_CRT_PARSE_C) && \
!defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
mbedtls_pk_free( &handshake->peer_pubkey );
#endif /* MBEDTLS_X509_CRT_PARSE_C && !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
#if defined(MBEDTLS_SSL_PROTO_DTLS)
mbedtls_free( handshake->verify_cookie );
ssl_flight_free( handshake->flight );